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FR2448164A1 - LAYING TIME ADJUSTMENT CIRCUIT FOR A CAMERA - Google Patents

LAYING TIME ADJUSTMENT CIRCUIT FOR A CAMERA

Info

Publication number
FR2448164A1
FR2448164A1 FR8002208A FR8002208A FR2448164A1 FR 2448164 A1 FR2448164 A1 FR 2448164A1 FR 8002208 A FR8002208 A FR 8002208A FR 8002208 A FR8002208 A FR 8002208A FR 2448164 A1 FR2448164 A1 FR 2448164A1
Authority
FR
France
Prior art keywords
circuit
manual
data
automatic
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR8002208A
Other languages
French (fr)
Other versions
FR2448164B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1056679A external-priority patent/JPS55103530A/en
Priority claimed from JP1056879A external-priority patent/JPS55103531A/en
Priority claimed from JP1056779A external-priority patent/JPS55103542A/en
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of FR2448164A1 publication Critical patent/FR2448164A1/en
Application granted granted Critical
Publication of FR2448164B1 publication Critical patent/FR2448164B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G03B7/083—Analogue circuits for control of exposure time
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/091—Digital circuits
    • G03B7/093—Digital circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)

Abstract

L'INVENTION CONCERNE UN CIRCUIT DE REGLAGE COMBINE MANUEL ET AUTOMATIQUE DU TEMPS DE POSE POUR APPAREIL PHOTOGRAPHIQUE DANS LEQUEL LA DONNEE D'EXPOSITION AUTOMATIQUE EST PRODUITE PHOTOMETRIQUEMENT ET LA DONNEE MANUELLE EST FIXEE MANUELLEMENT. LA DONNEE AUTOMATIQUE EST PRODUITE PAR UN CIRCUIT DE CALCUL 5 CONNECTE A DES CIRCUITS 1 A 4 DE COMPRESSION LOGARITHMIQUE DE LA BRILLANCE, DE LA SENSIBILITE DU FILM, DE LA VALEUR D'OUVERTURE ET DU FACTEUR D'EXPOSITION. LE SIGNAL DE SORTIE DU CIRCUIT DE CALCUL EST SELECTIVEMENT COUPLE, VIA UN CIRCUIT DE COMMUTATION 9 RECEVANT EGALEMENT LA DONNEE DE FIXATION DE TEMPS DE POSE MANUELLE APRES SA CONVERSION NUMERIQUE-ANALOGIQUE DANS UN CONVERTISSEUR 13, A UN CIRCUIT 15 DE DETERMINATION DE TEMPS DE DILATATION. CES DEUX SIGNAUX ANALOGIQUES SONT CONVERTIS A LA FORME NUMERIQUE PAR UN CONVERTISSEUR 14 ET SELECTIVEMENT APPLIQUES PAR UN CIRCUIT DE COMMUTATION 16 A UNE UNITE DE VISUALISATION 18, SELON LA POSITION D'UN COMMUTATEUR 19 DE SELECTION DE MODE MANUEL-AUTOMATIQUE. LE CIRCUIT DE L'INVENTION EST SIMPLE, PEU ENCOMBRANT ET PEU COUTEUX A FABRIQUER.THE INVENTION RELATES TO A CIRCUIT FOR COMBINED MANUAL AND AUTOMATIC APPLICATION TIME FOR A PHOTOGRAPHIC CAMERA IN WHICH THE AUTOMATIC EXPOSURE DATA IS PHOTOMETRICALLY PRODUCED AND THE MANUAL DATA IS SET MANUALLY. THE AUTOMATIC DATA IS PRODUCED BY A COMPUTING CIRCUIT 5 CONNECTED TO CIRCUITS 1 TO 4 OF LOGARITHMIC COMPRESSION OF THE BRIGHTNESS, OF THE SENSITIVITY OF THE FILM, OF THE OPENING VALUE AND OF THE EXPOSURE FACTOR. THE OUTPUT SIGNAL OF THE CALCULATION CIRCUIT IS SELECTIVELY TORQUE, VIA A SWITCHING CIRCUIT 9 ALSO RECEIVING THE MANUAL LAYING TIME SETTING DATA AFTER ITS DIGITAL-ANALOGUE CONVERSION IN A CONVERTER 13, TO A DILATION TIME DETERMINATION CIRCUIT 15 . THESE TWO ANALOGUE SIGNALS ARE CONVERTED TO DIGITAL FORM BY A CONVERTER 14 AND SELECTIVELY APPLIED BY A SWITCHING CIRCUIT 16 TO A DISPLAY UNIT 18, ACCORDING TO THE POSITION OF A MANUAL-AUTOMATIC MODE SELECTION SWITCH 19. THE CIRCUIT OF THE INVENTION IS SIMPLE, LOW BIGGER AND LOW COST TO MANUFACTURE.

FR8002208A 1979-02-01 1980-02-01 LAYING TIME ADJUSTMENT CIRCUIT FOR A CAMERA Granted FR2448164A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1056679A JPS55103530A (en) 1979-02-01 1979-02-01 Exposure time control circuit of camera
JP1056879A JPS55103531A (en) 1979-02-01 1979-02-01 Exposure time control circuit of camera
JP1056779A JPS55103542A (en) 1979-02-01 1979-02-01 Exposure time display circuit of camera

Publications (2)

Publication Number Publication Date
FR2448164A1 true FR2448164A1 (en) 1980-08-29
FR2448164B1 FR2448164B1 (en) 1984-01-13

Family

ID=27279012

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8002208A Granted FR2448164A1 (en) 1979-02-01 1980-02-01 LAYING TIME ADJUSTMENT CIRCUIT FOR A CAMERA

Country Status (4)

Country Link
US (1) US4306785A (en)
DE (1) DE3003745C2 (en)
FR (1) FR2448164A1 (en)
GB (2) GB2059612B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5670533A (en) * 1979-11-13 1981-06-12 Asahi Optical Co Ltd Control circuit for exposure time of camera
JPS5730822A (en) * 1980-07-31 1982-02-19 Olympus Optical Co Ltd Average photometry method at plural points of automatic exposure camera
JPS57195226A (en) * 1981-05-27 1982-11-30 Olympus Optical Co Ltd Automatic exposure controller of camera
JPH0823648B2 (en) * 1983-08-11 1996-03-06 株式会社ニコン Camera priority mode setting device
US5272497A (en) * 1989-07-25 1993-12-21 Asahi Kogaku Kogyo Kabushiki Kaisha Light source apparatus for endoscope
US5184159A (en) * 1989-07-25 1993-02-02 Asahi Kogaku Kogyo Kabushiki Kaisha Light source apparatus for endoscope
JP2868270B2 (en) * 1990-02-14 1999-03-10 旭光学工業株式会社 Camera exposure control device
KR100210005B1 (en) * 1991-04-15 1999-07-15 마츠모토 도루 Exposure control apparatus of camera
AU649805B2 (en) * 1991-04-15 1994-06-02 Asahi Kogaku Kogyo Kabushiki Kaisha Exposure control apparatus of camera
CA2066022C (en) * 1991-04-15 2000-08-15 Osamu Sato Exposure control apparatus of camera
JP5125010B2 (en) * 2006-07-20 2013-01-23 ソニー株式会社 Solid-state imaging device and control system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2241801A1 (en) * 1973-08-24 1975-03-21 Seiko Koki Kk
FR2261551A1 (en) * 1974-02-18 1975-09-12 Seiko Koki Kk
FR2261550A1 (en) * 1974-02-18 1975-09-12 Seiko Koki Kk

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5640811B2 (en) * 1972-12-29 1981-09-24
JPS6018927B2 (en) * 1975-11-06 1985-05-13 旭光学工業株式会社 Camera digital display circuit
JPS52119228A (en) * 1976-03-30 1977-10-06 Canon Inc Means for setting photograph information
JPS5358233A (en) * 1976-11-06 1978-05-26 Asahi Optical Co Ltd Digital control automatic exposure camera
JPS5379533A (en) * 1976-12-24 1978-07-14 Nippon Chemical Ind Exposure control device for camera

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2241801A1 (en) * 1973-08-24 1975-03-21 Seiko Koki Kk
FR2261551A1 (en) * 1974-02-18 1975-09-12 Seiko Koki Kk
FR2261550A1 (en) * 1974-02-18 1975-09-12 Seiko Koki Kk

Also Published As

Publication number Publication date
GB2059612B (en) 1983-05-25
US4306785A (en) 1981-12-22
DE3003745C2 (en) 1984-05-03
DE3003745A1 (en) 1980-08-07
GB2059612A (en) 1981-04-23
GB2045957B (en) 1983-03-30
GB2045957A (en) 1980-11-05
FR2448164B1 (en) 1984-01-13

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Legal Events

Date Code Title Description
DL Decision of the director general to leave to make available licences of right
ST Notification of lapse